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論文 |
論文
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森本, 雅憲 ; 鈴木, 将吾 ; 細川, 晃 ; 上田, 隆司 ; 田中, 隆太郎 ; Morimoto, Masanori ; Suzuki, Shogo ; Hosokawa, Akira ; Ueda, Takashi ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />In general, grinding heat causes various types of thermal damage to the workpiece, such as burning,
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cracks, and phase transformation. In this study, the grinding operation is regarded as a heat treatment process called grind-hardening. This new heat treatment method enables the phase transformation from austenite to martensite in the surface layer of steels. The cylindricalgrinding tests at several infeed rates are carried out. The hardened layer of approximately 0.16 mm is attained in plunge grinding of chrome-molybdenum steel SCM435. 研削時に発生する熱を積極的に利用して，加工と同時に熱処理する鋼材の同時硬化研削法（研削焼入れ）を試みている．本報では，CrMo鋼の円筒研削焼入れを行い，その可能性を実証している．工作物の研削面に変色した酸化膜がみられたとき，表面近傍に焼入れ処理がなさ，この酸化膜をスパークアウトによって除去することで焼入れされた仕上げ面が生成できる．乾式研削において，40micron/sをこえる砥石切込速度で，工作物表面近傍に700HV以上のマルテンサイト組織の硬化層が得られた．砥石切込速度に比例して，研削抵抗，硬化層深さの増加がみられる．本研究では最大深さ160micronを得ることができた.<br />出版者照会後に全文公開
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論文 |
論文
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佐藤, 昌彦 ; 上田, 隆司
概要:
In this paper, the activity of effective cutting grains in cutting of work and the activity of effective cutting grains in generation of finished surface are described. The former was investigated by the measurement of wheel surface
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temperature immediately after grinding using infrared radiation pyrometer with an optical fiber and the latter was investigated by the measurement of finished surface roughness using three-dimensional surface roughness tracer respectively. These activity of cutting grains in the whole circumference of wheel surface was clarified. The results obtained are as follows: 1) Cutting grains which have effective concern with cutting of work certainly act in every rotation of wheel. 2) The number of effective cutting grains in cutting of work increases as wheel depth of cut increases. 3) Cross-sectional shape of scratch toward grinding direction on the finished surface accurately correspond in the every period of one circumference of wheel in the order of sub-micrometer. 4) Finished surface is generated by some identical cutting grains even when wheel depth of cut increases.
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